One of the potential sources of an IP address leak while using a VPN is the WebRTC protocol.
WebRTC is a real-time communications framework built into most browsers that is used for peer-to-peer communications.
Tip: To test if your net web client is leaking your IP address,browserleaks.com/webrtchas a simple tool.
uBlock Origin
One of the tools that can block WebRTC from leaking your IP address is uBlock Origin.
uBlock Origin is still developed by the original developer and is generally considered superior.
To do this, tap on the uBlock Origin red shield icon in the extension bar.
Alternatively, you’re able to right-choose the shield icon and select Options from the drop-down list.
